AH276

COMPLEMENTARY OUTPUT HALL EFFECT LATCH General Description Features Data Sheet AH276 The AH276 is an integrated Hall sensor with output driver designed for electronic commutation of brushless DC motor applications. The device includes an onchip Hall sensor for magnetic sensing, an amplifier that amplifies the Hall voltage, a Schmitt trigger to provide switching hysteresis for noise rejection, a temperature compensation circuit to compensate the temperature drift of Hall sensitivity and two complementary open-collector drivers for sinking large load current. It also includes an internal band-gap regulator which is used to provide bias voltage for internal circuits. · On-Chip Hall Sensor · 3.5V to 16V Supply Voltage · 350mA (avg) Output Sink Current · Reversed Supply Voltage Protection · Build in Over Temperature Protection Function · -20oC to 85oC Operating Temperature · Low Profile TO-94 (SIP-4L) Package · ESD Rating: 300V (Machine Model) Applications Placing the device in a variable magnetic field, if the · Dual-Coil Brushless DC Motor magnetic flux density is larger than threshold BOP, the pin DO will be turned low (on) and pin DOB will be · · Dual-Coil Brushless DC Fan Revolution Counting turned high (off). This output state is held until the · Speed Measurement magnetic flux density reverses and falls below BRP, then causes DO to be turned high (off) and DOB turned low (on). AH276 is available in TO-94 (SIP-4L) package. Nov. 2009 Rev. 1. 4 TO-94 Figure 1. ...